Castle Rock is an 8,166-foot summit in Washington’s North Cascades, above the west shore of Lake Chelan on the border of Glacier Peak Wilderness and Lake Chelan National Recreation Area. Managed within Wenatchee National Forest, it is notable for its dramatic relief, rising 7,066 feet above the lake in only 2.5 miles. Its runoff reaches Lake Chelan by way of Castle Creek, Canyon Creek, and Bridal Veil Creek. The mountain also reflects the broader geologic history of the North Cascades, where tectonic accretion, volcanic activity, and repeated Pleistocene glaciation created the steep, rugged landscape, shaped further by the region’s wet winters and clearer summers.